Swift：從另一個視圖控制器調用ViewController func

我在FirstViewController.swift中有一個函數「addDoneButton」，我不想複製並粘貼到SecondViewController.swift中，所以我想在SecondViewController中調用它。Swift：從另一個視圖控制器調用ViewController func

func addDoneButton() { 
    let keyboardToolbar = UIToolbar() 
    keyboardToolbar.sizeToFit() 
    let flexBarButton = UIBarButtonItem(barButtonSystemItem: .FlexibleSpace, 
             target: nil, action: nil) 
    let doneBarButton = UIBarButtonItem(barButtonSystemItem: .Done, 
             target: view, action: #selector(UIView.endEditing(_:))) 
    keyboardToolbar.items = [flexBarButton, doneBarButton] 
    for textField in self.collectionOfTextField! as [UITextField] { 
     textField.keyboardType = .DecimalPad 
     textField.inputAccessoryView = keyboardToolbar 

    } 
}

如何實現它？預先感謝一個新swifter。

來源

2016-09-07 user6702783

如何創建UIViewController的擴展名並將collectionTextFields作爲參數？

extension UIViewController { 
    func addDoneButton(collectionTextFields: [UITextField]) { 
     let keyboardToolbar = UIToolbar() 
     keyboardToolbar.sizeToFit() 
     let flexBarButton = UIBarButtonItem(barButtonSystemItem: .FlexibleSpace, 
              target: nil, action: nil) 
     let doneBarButton = UIBarButtonItem(barButtonSystemItem: .Done, 
              target: view, action: #selector(UIView.endEditing(_:))) 

     keyboardToolbar.items = [flexBarButton, doneBarButton] 
     for textField in collectionTextFields { 
      textField.keyboardType = .DecimalPad 
      textField.inputAccessoryView = keyboardToolbar 
     } 
    } 
}

來源

2016-09-07 02:42:42 EridB

-1

剛剛嘗試這一點在你的SecondViewController.swift：

let firstViewController = FirstViewController()

而你需要的任何時間的函數只要致電：

firstViewController.addDoneButton()

來源

2016-09-07 02:48:34

Tthats創建FirstViewController的新實例，而不是正確的方法。 – crashoverride777

你可以做一個協議，然後把這個方法在自我：UIViewController的協議擴展中。然後，您要啓用此函數的任何UIViewController子類，只需將CanAddDoneButton添加到它所符合的協議即可。注意它已具有該collectionTextFields變量。儘管我認爲你甚至可以將該變量放入協議擴展中，除非它是IBOutlet。

protocol CanAddDoneButton { 
    var collectionTextFields: [UITextField] 
    func addDoneButton() 
} 

extension CanAddDoneButton where Self: UIViewController { 
    func addDoneButton() { .... } 
}

來源

2016-09-07 05:16:09

我覺得EridB的答案是一個好方法。

或者，Swift 2協議擴展是什麼？它與他的答案類似，唯一的區別是，除非符合協議，否則並非所有ViewController都可以訪問該方法。

protocol Button { } 
extension Button where Self: UIViewController { 

    func addDoneButton(forCollectionTextFields collectionTextFields: [UITextField]) { 
     let keyboardToolbar = UIToolbar() 
keyboardToolbar.sizeToFit() 
     let flexBarButton = UIBarButtonItem(barButtonSystemItem: .FlexibleSpace, 
            target: nil, action: nil) 
     let doneBarButton = UIBarButtonItem(barButtonSystemItem: .Done, 
            target: view, action: #selector(UIView.endEditing(_:))) 
     keyboardToolbar.items = [flexBarButton, doneBarButton] 
for textField in collectionTextFields { 
      textField.keyboardType = .DecimalPad 
      textField.inputAccessoryView = keyboardToolbar 

     } 
    } 

}

比你的viewControllers需要調用這個方法你符合協議，只是調用它。

class SomeViewController: UIViewController, Button { 

    override func viewDidLoad() { 
    super.viewDidLoad() 

     addDoneButton(forCollectionTextFields: self.collectionOfTextField) 
    } 
    }

希望這有助於

來源

2016-09-07 14:24:50 crashoverride777

Swift：從另一個視圖控制器調用ViewController func

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